Central air conditioning systems

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What is Residential Air conditioning systems ?

Your apartment have to be conditioned in the summer, so coil x offer a wide rage of residential air conditioning systems. 

  1. Hi- wall 
  2. Concealed
  3. Hi-wall inverter
  4. concealed inverter

Here is an overview of the typical air conditioning systems you’ll find in today’s homes:

Window Air Conditioner :

This is the old type of residential air conditioning system installed in single rooms. All parts, including the compressor, condenser, and both evaporator and cooling coils are enclosed in a single unit. These air conditioning units are installed in a slot on the wall, or more commonly, through a window sill, hence the name. The area where the unit meets the wall opening must be sealed to prevent heat intrusion and ensure air conditioner efficiency.

Split Air Conditioner :

Split air conditioners are comprised of an outdoor unit and indoor unit. The outdoor unit is installed outside the room as a free-standing unit and contains the compressor, condenser, and expansion valve. The much smaller indoor unit installed on a wall and houses the evaporator and cooling coils, as well as the cooling fan itself.

Unlike window-mounted units, split air conditioners require a much smaller hole to accommodate the connecting piping. This allows more flexibility with unit placement, as you can have the outdoor unit installed out of sight, even on a flat roof. Certain air conditioning systems even have a built-in heating element that generates heat during cold days and blows it into the room.

Packaged Air Conditioner :

If you need to cool more than one room or even the entire house with a single unit, consider getting a packaged air conditioner instead. The single-unit setup has all components housed in a single box like its window-mounted counterpart, with the cool air blown through the ductwork using a high-capacity blower. Another kind of setup is similar to a split AC, but with several indoor units attached to a central outdoor unit.


How does VRV/ VRF work?

VRV is a technology that alternates the refrigerant volume in a system to match a building's precise requirements. Only a minimum amount of energy is required for a system to maintain set temperatures, and ensure that it automatically shuts off when no occupants are detected in a room. This unique mechanism achieves more sustainability in the long run, as end users save on energy costs while reducing their system’s carbon emissions.

With up to 64 indoor units connected to 1 outdoor unit, the VRV system operates similar to a Multi-Split system. Each individual indoor unit determines the capacity it needs based on the current indoor temperature and requested temperature from the remote control (set point).

The total demand among all indoor units will determine how the outdoor unit adjusts the refrigerant volume and temperature accordingly. By only supplying the cooling or heating that is needed, the inverter compressor continues to save a large amount of energy during VRV operation.

VRF explained

Complexity is the name of the game when describing the technical nature of how variable refrigerant flow technology works. The simplest explanation of VRF is to describe it as a large-scale ductless HVAC system that can perform at a high capacity. The specific design of a VRF system varies based on application. In general, VRF technology provides the ability for multiple indoor units or zones to operate on the same system. VRF systems can either be a heat pump system or a heat recovery system, which provides simultaneous heating and cooling.

VRF system diagram

VRF HVAC technology myths & facts :

Fact: VRF systems provide simultaneous heating and cooling.

A VRF HVAC system can heat and cool different zones or rooms within a building at the same time. If the appropriate VRF system is selected, building occupants have the ability to customize the temperature settings to their personal preferences.

Myth: VRF can only be used in commercial applications.

VRF equipment can be used in conjunction with a wide range of heating and cooling products. This means that a VRF system can be scaled to meet the climate control needs of a small single-family residence all the way to a commercial high-rise building.

Fact: VRF systems run at a very low volume.

Unlike some older HVAC technologies, VRF systems are extremely quiet. Installing a VRF system has the added benefit of reducing ambient noise both inside and outside of a building.

Myth: VRF HVAC units are bulky.

VRF equipment is sleek and compact compared to other HVAC equipment. This makes VRF an excellent solution for installing HVAC equipment in areas with limited space, such as when renovating historical buildings.

Fact: VRF systems are easy to install.

Because VRF equipment weighs much less than ducted equipment, installing a VRF system is easier and requires less physical effort than a traditional HVAC system.

Pro tip:  VRF installation should only be performed by professionals who are factory trained and certified based on the type of VRF system being implemented.
 Having a building that stays cool in the summer and warm in the winter – keeping your employees and clients comfortable year-round, is something you may take for granted. Understanding your commercial building’s HVAC system is an important detail for many reasons, not the least of which is keeping the system humming along so you aren’t stuck baking in the summer when something goes wrong, costing time and money. Today, we’ll explain some details about commercial building HVAC systems, how they work, what to expect for maintenance and more. 

What is a Commercial HVAC System And How Does It Work?

Heating, Ventilation, and Cooling systems, otherwise known as HVAC systems, are an integral part of modern buildings. HVAC systems are in charge of    keeping temperatures comfortable ( usually around 24 degrees ), Humidity consistent between ( 40-60%), and indoor air quality high ( keeping co2 to less than 1000 PPM)     

There are several different types of commercial HVAC systems, but in general, these systems operate similarly:

  • Air conditioning units lower the temperature by passing air through refrigerant or water-cooled systems, also removing excess moisture from the air in the process.
  • Heating systems essentially work in the opposite fashion of air conditioning/cooling systems, where air passes through systems that heat the air using water, radiator coils, or gas.
  • Ventilation systems keep the air clean by circulating air with fans and passing air through filtration systems.

What Are The Different Types Of HVAC Systems?

If you’ve looked into replacement, repair, or maintenance of your buildings’ HVAC system, you’ll know that there are an overwhelming number of combinations of different types of systems. While this is true, all of these various types fall into 3 main categories 

  • Single Split System : This is the most popular and affordable type of HVAC system, found most commonly in smaller commercial buildings. These systems allow individual control of the heating and cooling for each space, making it ideal for offices with server rooms or restaurants. 

These systems typically include air conditioners that pass air by refrigerant lines and furnaces in one system that circulates air throughout the space via air ducts. The drawback of single split systems is that for each space you wish to control separately, you’ll need an outdoor unit – taking up precious space.

  • Multi-Split System : Multi-split systems operate similarly to the single split system, but offer much higher energy efficiency and much smaller outdoor footprint. Multi-split systems allow you to connect up to 9 indoor units to one outdoor unit. These systems also include sensors that detect temperature changes and can adjust as needed, consuming far less energy. 

Heat pumps in this type of system are also designed to move air in a way that works with the natural flow of warm air into cool areas, saving money and energy. These systems do require more installation time, so the cost of installation can be higher.

  • VRF (variable refrigerant flow) or VRV (variable refrigerant volume) Systems :  These systems are best for larger mixed-use type buildings, such as larger office buildings or hotels. 

Heat Recovery VRF systems can provide heating and cooling to different spaces at once, using warm air “waste heat” from areas of the building and delivering it to where heat is required, especially great for buildings with lots of smaller rooms. Heat pump VRF systems deliver either heat or cooling, and are best for larger open areas. 

How Long Do HVAC Systems Last?

In a world of constantly changing technology, as well as changing environmental conditions both indoors and out, HVAC systems require different kinds of care – and you may be tempted to upgrade more frequently. The current commercial HVAC units should last 10-15 years. Some of the factors that impact the longevity of your HVAC include:

  • Usage demand over the years; climate of your area
  • Quality and efficiency of the system
  • Proper installation and maintenance

What Kind Of Maintenance Do Commercial HVAC Systems Require?

Regular maintenance can keep your HVAC system working at its most efficient, keeping it humming along for its full life expectancy – or beyond. Along with maximizing the lifespan of your HVAC system, proper regular maintenance can lower energy costs, reduce the need for costly repairs and downtime, and guarantee constant comfort for your clients and employees. Preventative maintenance includes tasks such as:

  • Spring and Fall system checkups that include:
    • Cleaning and inspecting all outdoor components
    • Refrigerant levels measured and recharged as needed
    • Blower, belts, evaporator coil, and other indoor cooling system components are inspected and cleaned 
    • Burner assemblies, ignition systems, and other indoor heating system components are inspected and cleaned
    • Control systems are tested
  • Air Filters checked and changed regularly, according to manufacturer’s recommendations
  • Thermostat programming checked and reset seasonally
  • Monthly visual inspection of thermostats, drip pans, and drain lines

Difference between concealed and hi-wall 
How to estimate your devices appropriate capacity

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